Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
nam thuc » nam thuoc, am thuc, nam thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ty » sach tu, sach thu, xach tay
di cua » dai cua, doi cua, de cua
ve nam » he nam, va nam, le nam
cua su » qua su

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach y)) nang xa hoi. hieu ve nam thuc ((ban thanh) OR (ban hanh)) di cua su~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) or (sach y)) nang xa hoi. hieu ve nam thuc ((ban thanh) OR (ban hanh)) di cua su~".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sach y)) nang xa hoi. hieu ve nam thuc ((ban thanh) OR (ban hanh)) di cua su*.